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camera.js
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camera.js
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define(function(require, exports, module) {
'use strict';
/**
* Module Dependencies
*/
var CameraUtils = require('lib/camera-utils');
var getVideoMetaData = require('lib/get-video-meta-data');
var orientation = require('lib/orientation');
var debug = require('debug')('camera');
var debounce = require('lib/debounce');
var bindAll = require('lib/bind-all');
var model = require('vendor/model');
var mix = require('lib/mixin');
var Focus = require('lib/camera/focus');
/**
* Mixin `Model` API (inc. events)
*/
model(Camera.prototype);
/**
* Exports
*/
module.exports = Camera;
/**
* Initialize a new 'Camera'
*
* Options:
*
* - {object} `focus`
*
* @param {Object} options
*/
function Camera(options) {
debug('initializing');
bindAll(this);
// Options
options = options || {};
// mozCamera config is cached by default
this.cacheConfig = options.cacheConfig !== false;
// Minimum video duration length for creating a
// video that contains at least few samples, see bug 899864.
this.minRecordingTime = options.minRecordingTime || 1000;
// Number of bytes left on disk to let us stop recording.
this.recordSpacePadding = options.recordSpacePadding || 1024 * 1024 * 1;
// The minimum available disk space to start recording a video.
this.recordSpaceMin = options.recordSpaceMin || 1024 * 1024 * 2;
// Test hooks
this.getVideoMetaData = options.getVideoMetaData || getVideoMetaData;
this.orientation = options.orientation || orientation;
this.configStorage = options.configStorage || localStorage;
this.cameraList = navigator.mozCameras.getListOfCameras();
this.mozCamera = null;
this.storage = options.storage || {};
// Video config
this.video = {
filepath: null,
minSpace: this.recordSpaceMin,
spacePadding : this.recordSpacePadding
};
this.focus = new Focus(options.focus);
// Indicate this first
// load hasn't happened yet.
this.isFirstLoad = true;
// Always boot in 'picture' mode
// with 'back' camera. This may need
// to be configurable at some point.
this.mode = 'picture';
this.selectedCamera = 'back';
// Allow `configure` to be called multiple
// times in the same frame, but only ever run once.
this.configure = debounce(this.configure);
debug('initialized');
}
/**
* Loads the currently selected camera.
*
* There are cases whereby the camera
* may still be 'releasing' its hardware.
* If this is the case we wait for the
* release process to finish, then attempt
* to load again.
*
* @public
*/
Camera.prototype.load = function() {
debug('load camera');
// First load is different as we
// fetch the mozCameraConfig from
// the previous session and boot
// with that to optimize startup.
if (this.isFirstLoad) {
this.firstLoad();
return;
}
var loadingNewCamera = this.selectedCamera !== this.lastLoadedCamera;
var self = this;
// If hardware is still being released
// we're not allowed to request the camera.
if (this.releasing) {
debug('wait for camera release');
this.once('released', function() { self.load(); });
return;
}
// Don't re-load hardware if selected camera is the same.
if (this.mozCamera && !loadingNewCamera) {
this.setupNewCamera(this.mozCamera);
debug('camera not changed');
return;
}
// If a camera is already loaded,
// it must be 'released' first.
// We also discard the `mozCameraConfig`
// as the previous camera config
// won't apply to the new camera.
if (this.mozCamera) {
this.mozCameraConfig = null;
this.release(ready);
} else {
ready();
}
// Once ready we request the camera
// with the currently `selectedCamera`
// and any `mozCameraConfig` that may
// be in memory.
//
// The only time there should be a
// valid `mozCameraConfig` in memory
// is when the app becomes visible again
// after being hidden. and we wish to
// request the camera again in exactly
// the same state it was previously in.
function ready() {
self.requestCamera(self.selectedCamera, self.mozCameraConfig);
self.lastLoadedCamera = self.selectedCamera;
}
};
/**
* When the camera is loaded for the first
* time run this specially optimized load path.
*
* We fetch the a previous camera config from storage
* and request the camera *with* a configuration.
*
* This means that we get back a pre-configured
* mozCamera and we don't have to run `.configure()`
* on the critical path. This saves us ~400ms.
*
* @private
*/
Camera.prototype.firstLoad = function() {
debug('first load');
var config = this.fetchBootConfig() || {};
var self = this;
// Save this to memory so that we can re-request
// the camera quickly after it has been .release()'d.
this.mozCameraConfig = config.mozCameraConfig;
// Request the camera, passing in the config.
// If this is the first time the camera app
// has been used `mozCameraConfig` will be undefined.
this.requestCamera(this.selectedCamera, this.mozCameraConfig);
// Set the pictureSize and recorderProfile
// as soon as we get the camera hardware.
// Set the `pictureSize` and `recorderProfile`
// from the cache so that any subsequent requests
// to `setPictureSize` and `setRecorderProfile`
// don't trigger slow hardware configuration.
this.once('newcamera', function() {
var noConfigure = { configure: false };
self.setPictureSize(config.pictureSize, noConfigure);
self.setRecorderProfile(config.recorderProfile, noConfigure);
});
// First load is done.
this.isFirstLoad = false;
};
/**
* Save the current camera configuration
* to persistent storage.
*
* This configuration is later used by
* `.firstLoad()` to optimize the
* first camera request.
*
* We only save the config if the camera
* is using the 'back' camera in 'picture'
* mode, as this is the mode we boot
* the camera in. If partners have issues
* with this, perhap we can make this
* configurable.
*
* We're using localStorage because it's
* currently the fastest option.
*
* @private
*/
Camera.prototype.saveBootConfig = function() {
if (!this.cacheConfig) { return; }
if (this.selectedCamera !== 'back') { return; }
if (this.mode !== 'picture') { return; }
// Store the things we need for quickLoad
var json = {
mozCameraConfig: this.mozCameraConfig,
recorderProfile: this.recorderProfile,
pictureSize: this.pictureSize
};
this.configStorage.setItem('cameraBootConfig', JSON.stringify(json));
debug('saved camera config', json);
};
/**
* Fetch the boot config from storage.
*
* We use this config to optimize the
* first load of the camera on the
* app's critical path.
*
* @return {Object}
*/
Camera.prototype.fetchBootConfig = function() {
var string = this.configStorage.getItem('cameraBootConfig');
var json = string && JSON.parse(string);
debug('got camera config', json);
return json;
};
/**
* Requests the mozCamera object,
* then configures it.
*
* @private
*/
Camera.prototype.requestCamera = function(camera, config) {
debug('request camera', camera, config);
if (this.isBusy) { return; }
var self = this;
// Indicate 'busy'
this.busy('requestingCamera');
// If a config was passed we assume
// the camera has been configured.
this.configured = !!config;
navigator.mozCameras.getCamera(camera, config || {}, onSuccess, onError);
debug('camera requested', camera, config);
function onSuccess(mozCamera) {
debug('successfully got mozCamera');
self.setupNewCamera(mozCamera);
self.configureFocus();
self.emit('focusconfigured', {
mode: self.mozCamera.focusMode,
touchFocus: self.focus.touchFocus,
faceDetection: self.focus.faceDetection,
maxDetectedFaces: self.focus.maxDetectedFaces
});
// If the camera was configured in the
// `mozCamera.getCamera()` call, we can
// fire the 'configured' event now.
if (self.configured) { self.emit('configured'); }
self.ready();
}
function onError(err) {
debug('error requesting camera', err);
self.ready();
}
};
/**
* Configures the newly recieved
* mozCamera object.
*
* Setting the 'cababilities' key
* triggers 'change' callback inside
* the CameraController that sets the
* app up for the new camera.
*
* @param {MozCamera} mozCamera
* @private
*/
Camera.prototype.setupNewCamera = function(mozCamera) {
debug('configuring camera');
var capabilities = mozCamera.capabilities;
this.mozCamera = mozCamera;
// Bind to some events
this.mozCamera.onShutter = this.onShutter;
this.mozCamera.onPreviewStateChange = this.onPreviewStateChange;
this.mozCamera.onRecorderStateChange = this.onRecorderStateChange;
this.capabilities = this.formatCapabilities(capabilities);
this.emit('newcamera', this.capabilities);
debug('configured new camera');
};
/**
* Camera capablities need to be in
* a consistent format.
*
* We shallow clone to make sure the
* app doesnt' make changes to the
* original `capabilities` object.
*
* @param {Object} capabilities
* @return {Object}
*/
Camera.prototype.formatCapabilities = function(capabilities) {
var hasHDR = capabilities.sceneModes.indexOf('hdr') > -1;
var hdr = hasHDR ? ['on', 'off'] : undefined;
return mix({ hdr: hdr }, capabilities);
};
/**
* Configure the camera hardware
* with the current `mode`, `previewSize`
* and `recorderProfile`.
*
* @private
*/
Camera.prototype.configure = function() {
debug('configuring hardware...');
var self = this;
// As soon as a request to configure
// comes in, the confuguration is now
// dirty (out-of-date), and the hardware
// must be reconfigured at some point.
this.configured = false;
// Ensure that any requests that
// come in whilst busy get run once
// camera is ready again.
if (this.isBusy) {
debug('defering configuration');
this.once('ready', this.configure);
return;
}
// Exit here if there is no camera
if (!this.mozCamera) {
debug('no mozCamera');
return;
}
// Indicate 'busy'
this.busy();
// Create a new `mozCameraConfig`
this.mozCameraConfig = {
mode: this.mode,
previewSize: this.previewSize(),
recorderProfile: this.recorderProfile
};
// Configure the camera hardware
this.mozCamera.setConfiguration(this.mozCameraConfig, onSuccess, onError);
debug('mozCamera configuring', this.mozCameraConfig);
function onSuccess() {
debug('configuration success');
if (!self.mozCamera) { return; }
self.configureFocus();
self.configured = true;
self.saveBootConfig();
self.emit('configured');
self.ready();
}
function onError() {
console.log('Error configuring camera');
self.configured = true;
self.ready();
}
};
Camera.prototype.configureFocus = function() {
var focusMode;
// Determines focus mode based on camera mode
// If we're taking still pictures, and C-AF is enabled
if (this.mode === 'picture') {
focusMode = 'continuous-picture';
} else if (this.mode === 'video'){
focusMode = 'continuous-video';
}
this.focus.configure(this.mozCamera, focusMode);
this.focus.onFacesDetected = this.onFacesDetected;
this.focus.onAutoFocusChanged = this.onAutoFocusChanged;
};
Camera.prototype.onAutoFocusChanged = function() {
this.set('focus', 'autofocus');
};
Camera.prototype.onFacesDetected = function(faces) {
this.emit('facesdetected', faces);
};
/**
* Plugs Video Stream into Video Element.
*
* @param {Elmement} videoElement
* @public
*/
Camera.prototype.loadStreamInto = function(videoElement) {
debug('loading stream into element');
if (!this.mozCamera) {
debug('error - `mozCamera` is undefined or null');
return;
}
// REVIEW: Something is wrong if we are
// calling this without a video element.
if (!videoElement) {
debug('error - `videoElement` is undefined or null');
return;
}
// Don't load the same camera stream again
var isCurrent = videoElement.mozSrcObject === this.mozCamera;
if (isCurrent) { return debug('camera didn\'t change'); }
videoElement.mozSrcObject = this.mozCamera;
videoElement.play();
debug('stream loaded into video');
};
/**
* Return available preview sizes.
*
* @return {Array}
* @private
*/
Camera.prototype.previewSizes = function() {
if (!this.mozCamera) { return; }
return this.mozCamera.capabilities.previewSizes;
};
/**
* Return the current optimal preview size.
*
* @return {Object}
* @private
*/
Camera.prototype.previewSize = function() {
var sizes = this.previewSizes();
var profile = this.resolution();
var size = CameraUtils.getOptimalPreviewSize(sizes, profile);
debug('get optimal previewSize', size);
return size;
};
/**
* Get the current recording resolution.
*
* @return {Object}
*/
Camera.prototype.resolution = function() {
switch (this.mode) {
case 'picture': return this.pictureSize;
case 'video': return this.getRecorderProfile().video;
}
};
/**
* Set the picture size.
*
* If the given size is the same as the
* currently set pictureSize then no
* action is taken.
*
* The camera is 'configured' a soon as the
* pictureSize is changed. `.configure` is
* debounced so it will only ever run once
* per turn.
*
* Options:
*
* - {Boolean} `configure`
*
* @param {Object} size
*/
Camera.prototype.setPictureSize = function(size, options) {
debug('set picture size', size);
if (!size) { return; }
// Configure unless `false`
var configure = !(options && options.configure === false);
// Don't do waste time re-configuring the
// hardware if the pictureSize hasn't changed.
if (this.isPictureSize(size)) {
debug('pictureSize didn\'t change');
return;
}
this.mozCamera.setPictureSize(size);
this.pictureSize = size;
this.setThumbnailSize();
// Configure the hardware only when required
if (configure) { this.configure(); }
debug('pictureSize changed');
return this;
};
Camera.prototype.isPictureSize = function(size) {
if (!this.pictureSize) { return false; }
var sameWidth = size.width === this.pictureSize.width;
var sameHeight = size.height === this.pictureSize.height;
return sameWidth && sameHeight;
};
/**
* Set the recorder profile.
*
* If the given profile is the same as
* the current profile, no action is
* taken.
*
* The camera is 'configured' a soon as the
* recorderProfile is changed (`.configure()` is
* debounced so it will only ever run once
* per turn).
*
* Options:
*
* - {Boolean} `configure`
*
* @param {String} key
*/
Camera.prototype.setRecorderProfile = function(key, options) {
debug('set recorderProfile: %s', key);
if (!key) { return; }
// Configure unless `false`
var configure = !(options && options.configure === false);
// Exit if not changed
if (this.isRecorderProfile(key)) {
debug('recorderProfile didn\'t change');
return;
}
this.recorderProfile = key;
if (configure) { this.configure(); }
debug('recorderProfile changed: %s', key);
return this;
};
Camera.prototype.isRecorderProfile = function(key) {
return key === this.recorderProfile;
};
/**
* Returns the full profile of the
* currently set recordrProfile.
*
* @return {Object}
*/
Camera.prototype.getRecorderProfile = function() {
var key = this.recorderProfile;
return this.mozCamera.capabilities.recorderProfiles[key];
};
Camera.prototype.setThumbnailSize = function() {
var sizes = this.mozCamera.capabilities.thumbnailSizes;
var pictureSize = this.mozCamera.getPictureSize();
var picked = this.pickThumbnailSize(sizes, pictureSize);
if (picked) { this.mozCamera.setThumbnailSize(picked); }
};
/**
* Sets the current flash mode,
* both on the Camera instance
* and on the cameraObj hardware.
*
* @param {String} key
*/
Camera.prototype.setFlashMode = function(key) {
if (this.mozCamera) {
// If no key was provided, set it to 'off' which is
// a valid flash mode.
key = key || 'off';
this.mozCamera.flashMode = key;
debug('flash mode set: %s', key);
}
return this;
};
/**
* Releases the camera hardware.
*
* @param {Function} done
*/
Camera.prototype.release = function(done) {
debug('release');
done = done || function() {};
var self = this;
// Ignore if there is no loaded camera
if (!this.mozCamera) {
done();
return;
}
this.busy();
this.stopRecording();
this.focus.stopFaceDetection();
this.set('focus', 'none');
this.mozCamera.release(onSuccess, onError);
this.releasing = true;
this.mozCamera = null;
function onSuccess() {
debug('successfully released');
self.ready();
self.releasing = false;
self.emit('released');
done();
}
function onError(err) {
debug('failed to release hardware');
self.ready();
self.releasing = false;
done(err);
}
};
// TODO: Perhaps this function should be moved into a separate lib
Camera.prototype.pickThumbnailSize = function(thumbnailSizes, pictureSize) {
var screenWidth = window.innerWidth * window.devicePixelRatio;
var screenHeight = window.innerHeight * window.devicePixelRatio;
var pictureAspectRatio = pictureSize.width / pictureSize.height;
var currentThumbnailSize;
var i;
// Coping the array to not modify the original
thumbnailSizes = thumbnailSizes.slice(0);
if (!thumbnailSizes || !pictureSize) {
return;
}
function imageSizeFillsScreen(pixelsWidth, pixelsHeight) {
return ((pixelsWidth >= screenWidth || // portrait
pixelsHeight >= screenHeight) &&
(pixelsWidth >= screenHeight || // landscape
pixelsHeight >= screenWidth));
}
// Removes the sizes with the wrong aspect ratio
thumbnailSizes = thumbnailSizes.filter(function(thumbnailSize) {
var thumbnailAspectRatio = thumbnailSize.width / thumbnailSize.height;
return Math.abs(thumbnailAspectRatio - pictureAspectRatio) < 0.05;
});
if (thumbnailSizes.length === 0) {
console.error('Error while selecting thumbnail size. ' +
'There are no thumbnail sizes that match the ratio of ' +
'the selected picture size: ' + JSON.stringify(pictureSize));
return;
}
// Sorting the array from smaller to larger sizes
thumbnailSizes.sort(function(a, b) {
return a.width * a.height - b.width * b.height;
});
for (i = 0; i < thumbnailSizes.length; ++i) {
currentThumbnailSize = thumbnailSizes[i];
if (imageSizeFillsScreen(currentThumbnailSize.width,
currentThumbnailSize.height)) {
return currentThumbnailSize;
}
}
return thumbnailSizes[thumbnailSizes.length - 1];
};
/**
* Takes a photo, or begins/ends
* a video capture session.
*
* Options:
*
* - `position` {Object} - geolocation to store in EXIF
*
* @param {Object} options
* public
*/
Camera.prototype.capture = function(options) {
switch (this.mode) {
case 'picture': this.takePicture(options); break;
case 'video': this.toggleRecording(options); break;
}
};
/**
* Take a picture.
*
* Options:
*
* - {Number} `position` - geolocation to store in EXIF
*
* @param {Object} options
*/
Camera.prototype.takePicture = function(options) {
debug('take picture');
this.busy();
var rotation = this.orientation.get();
var selectedCamera = this.selectedCamera;
var self = this;
var position = options && options.position;
var config = {
dateTime: Date.now() / 1000,
pictureSize: self.pictureSize,
fileFormat: 'jpeg'
};
// If position has been passed in,
// add it to the config object.
if (position) {
config.position = position;
}
// Front camera is inverted, so flip rotation
config.rotation = selectedCamera === 'front' ? -rotation : rotation;
// If the camera focus is 'continuous' or 'infinity'
// we can take the picture straight away.
if (this.focus.getMode() === 'auto') {
this.set('focus', 'focusing');
this.focus.focus(onFocused);
} else {
takePicture();
}
function onFocused(err) {
var focus = err ? 'fail' : 'focused';
self.set('focus', focus);
takePicture();
}
function takePicture() {
self.busy('takingPicture');
self.mozCamera.takePicture(config, onSuccess, onError);
}
function onError(error) {
var title = navigator.mozL10n.get('error-saving-title');
var text = navigator.mozL10n.get('error-saving-text');
// if taking a picture fails because there's
// already a picture being taken we ignore it.
if (error === 'TakePictureAlreadyInProgress') {
complete();
} else {
alert(title + '. ' + text);
debug('error taking picture');
complete();
}
}
function onSuccess(blob) {
var image = { blob: blob };
self.resumePreview();
self.set('focus', 'none');
self.emit('newimage', image);
debug('success taking picture');
complete();
}
function complete() {
self.set('focus', 'none');
self.ready();
}
};
Camera.prototype.updateFocusArea = function(rect, done) {
var self = this;
this.set('focus', 'focusing');
this.focus.updateFocusArea(rect, focusDone);
function focusDone(error) {
if (error) {
self.set('focus', 'fail');
} else {
self.set('focus', 'focused');
}
if (done) {
done(error);
}
}
};
/**
* Start/stop recording.
*
* @param {Object} options
*/
Camera.prototype.toggleRecording = function(options) {
var recording = this.get('recording');
if (recording) { this.stopRecording(); }
else { this.startRecording(options); }
};
/**
* Seet the storage for video.
*
* @public
*/
Camera.prototype.setVideoStorage = function(storage) {
this.storage.video = storage;
};
/**
* Start recording a video.
*
* @public
*/
Camera.prototype.startRecording = function(options) {
debug('start recording');
var frontCamera = this.selectedCamera === 'front';
var rotation = this.orientation.get();
var storage = this.storage.video;
var video = this.video;
var self = this;
// Rotation is flipped for front camera
if (frontCamera) { rotation = -rotation; }
this.busy();
// Lock orientation during video recording
//
// REVIEW: This should *not* be here. This
// is an App concern and should live in
// the `CameraController`.
this.orientation.stop();
// First check if there is enough free space
this.getFreeVideoStorageSpace(gotStorageSpace);
function gotStorageSpace(err, freeBytes) {
if (err) { return self.onRecordingError(); }
var notEnoughSpace = freeBytes < self.video.minSpace;
var remaining = freeBytes - self.video.spacePadding;
var targetFileSize = self.get('maxFileSizeBytes');
var maxFileSizeBytes = targetFileSize || remaining;
// Don't continue if there
// is not enough space
if (notEnoughSpace) {
self.onRecordingError('nospace2');
return;
}
// TODO: Callee should
// pass in orientation
var config = {
rotation: rotation,
maxFileSizeBytes: maxFileSizeBytes
};
self.createVideoFilepath(function(filepath) {
video.filepath = filepath;
self.emit('willrecord');
self.mozCamera.startRecording(
config,
storage,
filepath,
onSuccess,
self.onRecordingError);
});
}
function onSuccess() {
self.set('recording', true);
self.startVideoTimer();
self.ready();
// User closed app while
// recording was trying to start
//
// TODO: Not sure this should be here
if (document.hidden) {
self.stopRecording();
}
}
};
/**
* Stop recording the video.
*
* Once we have told the camera to stop recording
* the video we attach a 'change' listener to the
* video storage and wait. Once the listener fires
* we know that the video file has been saved.
*
* At this point we fetch the file Blob from
* storage and then call the `.onNewVideo()`
* method to handle the final stages.
*
* @public
*/
Camera.prototype.stopRecording = function() {
debug('stop recording');
var notRecording = !this.get('recording');
var filepath = this.video.filepath;
var storage = this.storage.video;
var self = this;
if (notRecording) { return; }
this.busy();
this.stopVideoTimer();
this.mozCamera.stopRecording();
this.set('recording', false);
// Unlock orientation when stopping video recording.
// REVIEW:WP This logic is out of scope of the
// Camera hardware. Only the App should be
// making such high level decicions.
this.orientation.start();
// Register a listener for writing
// completion of current video file
storage.addEventListener('change', onStorageChange);
function onStorageChange(e) {
debug('video file ready', e.path);
var matchesFile = e.path.indexOf(filepath) > -1;
// Regard the modification as video file writing
// completion if e.path matches current video
// filename. Note e.path is absolute path.
if (e.reason !== 'modified' || !matchesFile) { return; }
// We don't need the listener anymore.
storage.removeEventListener('change', onStorageChange);
// Re-fetch the blob from storage
var req = storage.get(filepath);
req.onerror = self.onRecordingError;
req.onsuccess = onSuccess;
function onSuccess() {
debug('got video blob');
self.onNewVideo({
blob: req.result,
filepath: filepath
});
}
}
};
/**